'use strict';
/*
 * Pig Chaincode Invoke
 */

var Fabric_Client = require('fabric-client');
var path = require('path');
var util = require('util');
var os = require('os');

//
var fabric_client = new Fabric_Client();

// setup the fabric network
var channel = fabric_client.newChannel('mychannel');
var peer = fabric_client.newPeer('grpc://localhost:7051');
channel.addPeer(peer);
var order = fabric_client.newOrderer('grpc://localhost:7050')
channel.addOrderer(order);

//
var member_user = null;
var store_path = path.join(__dirname, 'hfc-key-store');
console.log('Store path:'+store_path);
var tx_id = null;

module.exports = function() {
    var invoke_pig = {};

    invoke_pig.invoke_chaincode = function (options, callback) {

        // create the key value store as defined in the fabric-client/config/default.json 'key-value-store' setting
        Fabric_Client.newDefaultKeyValueStore({ path: store_path
        }).then((state_store) => {
            // assign the store to the fabric client
            fabric_client.setStateStore(state_store);
            var crypto_suite = Fabric_Client.newCryptoSuite();
            // use the same location for the state store (where the users' certificate are kept)
            // and the crypto store (where the users' keys are kept)
            var crypto_store = Fabric_Client.newCryptoKeyStore({path: store_path});
            crypto_suite.setCryptoKeyStore(crypto_store);
            fabric_client.setCryptoSuite(crypto_suite);

            // get the enrolled user from persistence, this user will sign all requests
            return fabric_client.getUserContext('user1', true);
        }).then((user_from_store) => {
            if (user_from_store && user_from_store.isEnrolled()) {
                console.log('Successfully loaded user1 from persistence');
                member_user = user_from_store;
            } else {
                throw new Error('Failed to get user1.... run registerUser.js');
            }

            // get a transaction id object based on the current user assigned to fabric client
            tx_id = fabric_client.newTransactionID();
            console.log("Assigning transaction_id: ", tx_id._transaction_id);
            console.log("Options.chaincode_args: %s", options.chaincode_args);
            var request = {
                //targets: let default to the peer assigned to the client
                chaincodeId: 'fabcar',
                fcn: options.chaincode_function,
                args: options.chaincode_args,
                chainId: 'mychannel',
                txId: tx_id
            };
            // send the transaction proposal to the peers
            return channel.sendTransactionProposal(request);
        }).then((results) => {
            var proposalResponses = results[0];
            var proposal = results[1];
            let isProposalGood = false;
            if (proposalResponses && proposalResponses[0].response &&
                proposalResponses[0].response.status === 200) {
                    isProposalGood = true;
                    console.log('Transaction proposal was good');
                } else {
                    console.error('Transaction proposal was bad');
                }
            if (isProposalGood) {
                console.log(util.format(
                    'Successfully sent Proposal and received ProposalResponse: Status - %s, message - "%s"',
                    proposalResponses[0].response.status, proposalResponses[0].response.message));

                // build up the request for the orderer to have the transaction committed
                var request = {
                    proposalResponses: proposalResponses,
                    proposal: proposal
                };

                // set the transaction listener and set a timeout of 30 sec
                // if the transaction did not get committed within the timeout period,
                // report a TIMEOUT status
                var transaction_id_string = tx_id.getTransactionID(); //Get the transaction ID string to be used by the event processing
                var promises = [];

                var sendPromise = channel.sendTransaction(request);
                promises.push(sendPromise); //we want the send transaction first, so that we know where to check status

                // get an eventhub once the fabric client has a user assigned. The user
                // is required bacause the event registration must be signed
                let event_hub = fabric_client.newEventHub();
                event_hub.setPeerAddr('grpc://localhost:7053');

                // using resolve the promise so that result status may be processed
                // under the then clause rather than having the catch clause process
                // the status
                let txPromise = new Promise((resolve, reject) => {
                    let handle = setTimeout(() => {
                        event_hub.disconnect();
                        resolve({event_status : 'TIMEOUT'}); //we could use reject(new Error('Trnasaction did not complete within 30 seconds'));
                    }, 3000);
                    event_hub.connect();
                    event_hub.registerTxEvent(transaction_id_string, (tx, code) => {
                        // this is the callback for transaction event status
                        // first some clean up of event listener
                        clearTimeout(handle);
                        event_hub.unregisterTxEvent(transaction_id_string);
                        event_hub.disconnect();

                        // now let the application know what happened
                        var return_status = {event_status : code, tx_id : transaction_id_string};
                        if (code !== 'VALID') {
                            console.error('The transaction was invalid, code = ' + code);
                            resolve(return_status); // we could use reject(new Error('Problem with the tranaction, event status ::'+code));
                        } else {
                            console.log('The transaction has been committed on peer ' + event_hub._ep._endpoint.addr);
                            resolve(return_status);
                        }
                    }, (err) => {
                        //this is the callback if something goes wrong with the event registration or processing
                        reject(new Error('There was a problem with the eventhub ::'+err));
                    });
                });
                promises.push(txPromise);

                return Promise.all(promises);
            } else {
                console.error('Failed to send Proposal or receive valid response. Response null or status is not 200. exiting...');
                throw new Error('Failed to send Proposal or receive valid response. Response null or status is not 200. exiting...');
            }
        }).then((results) => {
            console.log('Send transaction promise and event listener promise have completed');
            // check the results in the order the promises were added to the promise all list
            if (results && results[0] && results[0].status === 'SUCCESS') {
                console.log('Successfully sent transaction to the orderer.');
            } else {
                console.error('Failed to order the transaction. Error code: ' + response.status);
            }

            if(results && results[1] && results[1].event_status === 'VALID') {
                console.log('Successfully committed the change to the ledger by the peer');
                return callback(true);
            } else {
                console.log('Transaction failed to be committed to the ledger due to ::'+results[1].event_status);
                return callback(false);
            }
        }).catch((err) => {
            console.error('Failed to invoke successfully :: ' + err);
            return callback(false);
        });

    };

    return invoke_pig;
};
